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What should cut in and cut out on low pressure control be when used as a tstat

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85# cut-in and 65# cut-out to maintain 38f in the fresh food section
32#cut-in and 8#cut out to maintain 0f to 5f in the freezah.
See page 7

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Posted on Apr 06, 2011

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1 Answer

Getting 24v at tstat and condenser but not at contactor


Sounds like a pressure switch. Either high or low pressure. Manually press contactor in and make sure outdoor fan and compressor run. If no fan , likely high pressure.

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Coleman Evcon furnace blower runs w/ no call for heat. Temp is 5+ degrees above thermostat setting. (Programmable tstat)


When you say door are you referring to the front door or the furnace door? If the unit kicks on AND off by itself I would say it's in the tstat or the tstat wire. If it were internal I would think the blower relay or heat contactor/relay were getting stuck AND THE FAN WOULD NOT TURN OFF until you flipped the breaker. Good luck

Mar 21, 2017 | Coleman Heating & Cooling

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I have a ice-o-matic 400ha2 ice machine that is not making much ice and is to thick. the timer has been replaced,but no change


reduce the thickness thermostat that initiates the timer to minimum, then increase until good ice made.

Aug 29, 2014 | Kitchen Appliances - Others

1 Answer

Repaced fan motor, capacitor, contactor still fan not working.


press the contactor in using a wooden pencil does it come on? if so then you are not getting a control signal from the tstat or a low pressure (low freon switch) is open stopping the contactor from pulling in

May 21, 2013 | Goodman CKL49AR49 Air Conditioner

1 Answer

Tempstar air handler model #nfcp2400c2 with 5kw heat strip someone has installed a contactor on inside and taken the control board out is there anyway to bypass board to use as a straight cooling only...


Yes, you need a tstat, a contactor, and a transformer.
Contactor runs the fan, transformer sends the low voltage to the tstat. Tstat turns on contactor for fan and compressor for cooling

May 17, 2011 | ICP Vortex Fan Timer Control Board For Air...

1 Answer

My 9 year old Honeywell T8001C has no display. My FAU AC power breaker is not tripped. I tried a new Honeywell RTH2510B and a RTH7500D but the Fan does not come on with either of the new units after...


This is why battery powered tstats are misleading. The battery provides the power to the tstat but your unit is not providing low voltage in order to run. Air conditioners are controlled by relays and contactors. This means your unit constantly has high voltage going to it but each component runs through a relay in order to turn on. These relays are energized by the low voltage that runs through your tstat. Your tstat is not getting this low voltage. Either your float switch on your drain line is tripped, your blade style fuse is blown on the secondary side of the transformer or your transformer is bad.

Aug 08, 2017 | Honeywell Heating & Cooling

1 Answer

3 ton carrier split unit heat&cool,mod#38QH036300DL, Heat is good, thermostat will not shut it off. only way to shut the inside unit off is turn off the circuit breaker


Sounds like a bad tstat. The Tstat does control the on and off of the unit.
You can check the Tstat by taking off the white wire to the tstat and turning the heat to the on position and if it still comes on you have a bad wire. If it does not come on then you have a bad tstat.
Another option is to open the furnace and look inside at the control wires and follow them back to ensure that they are not shorted together anywhere inside the unit before checking the tstat wires.
If its the control wires then follow option 1 if not follow option 2.
1.Normally people who run tstat wire pull more wires than necessary to the tstat. Because of this you can use a different one for the heat which is white on the tstat. Remember that if you use another color on this then you need to change it on the inside unit as well. Otherwise it will not work. In other words change it on one end of the line you have to change it on the other to make it work.
To check the tstat wires, use continuity. Take all the wires off the tstat and the inside unit. These are the small control wires, not the main 110 wires. Check each one against each other to see if any of them are shorted together. Be sure to write down the wire colors and the terminals that they belong to on both sides before you take them off otherwise you will have big problems...
If you do not have another wire then pulling a new wire will be the next option.

2. If this does not solve it, then its the TSTAT, Replace it. Hope this helps.

Jan 28, 2011 | Heating & Cooling

1 Answer

Ruud ac unit, powers on and then off every few minutes


either tstat sensativity setting is too high or possible low pressure switch. if you have had to add freon before and never located the leak it would possibly be low on freon again. If you have replaced the tstat you may need to adjust the settings .

Nov 02, 2008 | Ruud UBHC Air Conditioner

1 Answer

Ruud heat pump high pressure cut off problem


That's going to be in your installer configuration. Check and make sure the G terminal has a wire connected to it at the tstat , and that connection it tight. In the configuration menu, make sure it is set for a heat pump, elected heat. It seems to me that the tstat doesn't know its connected to a heat pump. Should be able to locate aodel # for tstat on the back of it. And ask Mr. Google for a manual, if you don't have 1. Hope this helps!

Mar 18, 2017 | Heating & Cooling

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